Infineon Technologies CY7B9910-5SI

Overview

CY7B9910-5SI from Cypress Semiconductor is a low-skew, zero-delay clock buffer IC with eight TTL-compatible outputs, 15–80 MHz operation (FS-selectable), <250 ps max output skew, and integrated PLL for precise system clock distribution in industrial-grade embedded computing systems.

For engineers reviewing the CY7B9910-5SI datasheet, CY7B9910-5SI pinout, CY7B9910-5SI application, or CY7B9910-5SI equivalent, this device supports terminated 50Ω transmission line driving, offers 50% duty-cycle outputs with <1.2 ns duty cycle variation, and delivers stable timing for Pentium™-based processor clock trees requiring sub-nanosecond synchronization across multiple loads.

Technical Context

The CY7B9910-5SI implements a fully integrated phase-locked loop (PLL) with voltage-controlled oscillator (VCO), phase-frequency detector, and filter to achieve zero input-to-output propagation delay and tight output alignment. Its FS pin selects one of three VCO frequency ranges (15–30 / 25–50 / 40–80 MHz), enabling flexible clock multiplication via external feedback division.

It operates with dual supplies: VCCQ powers internal logic and PLL circuitry at 5V ±10%, while VCCN supplies TTL output drivers. The REF and FB inputs accept standard TTL-level signals, and all eight Q[0..7] outputs drive 50Ω-terminated lines with full-swing TTL levels (VOH ≥2.4V, VOL ≤0.45V at IOL = 46 mA).

Key Specifications

Pinout & Package

24-pin SOIC (S13, 300-mil) package with exposed pad not present; lead finish is matte tin, RoHS-compliant per legacy spec.

Key Features

Applications

Equivalent & Alternatives

CY7B9910-5SI has documented alternatives for industrial-grade low-skew clock buffering with TTL outputs.

Compared with ICS552GI-01LFT and MC100EP131FA, CY7B9910-5SI uniquely combines industrial-temp-rated 5V TTL compatibility, integrated zero-delay PLL, and eight matched outputs in a single SOIC package-making it irreplaceable for cost-sensitive, legacy 5V embedded clock trees requiring guaranteed sub-250 ps skew.

Availability

CY7B9910-5SI is available at Aetrix Electronics and suitable for industrial control systems, embedded computing platforms, and high-speed data acquisition modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY7B9910-5SI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Cypress Semiconductor (now part of Infineon Technologies) is a U.S.-based semiconductor company founded in 1982, specializing in timing, memory, microcontrollers, and programmable logic solutions for industrial, automotive, and communications markets.

The CY7B99xx family was designed specifically for high-reliability, low-skew clock distribution in 5V TTL-based computing systems-targeting Pentium™-era motherboards, industrial PLCs, and instrumentation where deterministic timing and board-level skew reduction were critical design constraints.

FAQ

What is the maximum supported load capacitance for CY7B9910-5SI outputs?

The device is characterized for 30 pF load capacitance in –2 and –5 speed grades (including fixture and probe). It can drive up to 50 pF as specified in AC test conditions, but rise/fall times degrade beyond 30 pF-designers should verify timing margins with actual board trace capacitance and termination.

Can CY7B9910-5SI operate without an external feedback connection?

No-FB must be connected to one of the Q outputs to close the PLL loop for zero-delay operation. If FB is left floating or unconnected, the PLL fails to lock and outputs become unstable or non-functional; the TEST pin can bypass PLL but requires REF input to be active.

Is the FS pin strictly binary, or does it require specific voltage thresholds?

FS is a three-level input: LOW (0–1.0 V), MID (VCC/2 ± 500 mV), and HIGH (VCC–1 V to VCC). Internal termination holds unconnected pins at VCC/2; incorrect voltage levels cause undefined VCO range selection and may prevent PLL lock or increase jitter beyond spec.

Does CY7B9910-5SI support spread-spectrum clocking?

No-this device lacks spread-spectrum modulation capability. Its PLL is optimized for fixed-frequency, low-jitter operation. Spread-spectrum functionality requires external modulation circuitry or a dedicated spread-spectrum clock generator IC such as the Si534x series.